GSC Power-Division S1 camshafts for the USDM 04-07 STi. These will not drop any low end power, but actually cause faster spool of the turbo, creating more power and torque across the entire rpm range. Good for stock turbo or up to 500WHP(GT35R) upgrades. These cams require upgraded valve springs to keep everything safe at high rpm.
 
Intake 268 / 225 @ .040" / Peak Lift 10.8mm / Centerline AVCS 
Exhaust 266 / 225 @ .040" / Peak Lift 10.4mm / Centerline 113 

GSC Power-Division S2 camshafts for the USDM 04-07 STi. These cams are built to suite the high horsepower Subys. With a power range of 500WHP and up, you need some certain mods to utilize the true potential of the S2s. Built motor, with a built/ported head, and a good engine management system. Dual valve springs are recommended, but a upgraded single spring kit will do the job under 8000 rpm. 

Intake 272 / 226 @ .050" / Peak Lift 10.5MM / Centerline AVCS 
Exhaust 272 / 232 @ .050" / Peak Lift 10.2mm / Centerline 113 

GSC Power-Division S3 camshafts for the USDM 04-07 STi. These cams are built to suite the highest horsepower drag Subys. With a power range of 750-1000WHP and a rev range of 4500-9500rpms, you need some certain mods to utilize the true potential of the S3s. Built motor, with a built/ported head (clearanced for lift), and a standalone engine management system. Dual valve springs are recommended. ($150.00 upcharge for S3s)

**Due to the lob size, head castings may need to be filled down slightly for clearance. 

Intake 282 / 240 @ .050" / Peak Lift 11.3MM / Centerline AVCS 
Exhaust 282 / 240 @ .050" / Peak Lift 11.3mm / Centerline 113 


*Requires upgraded valve springs*